Suspension-support for electric lamps.



J. I. GERMAN 61: A. 0. POOL SUSPENSION SUPPORT FOR ELBGTRIG LAMPS.APPLICATION rum) Emu, 1913.

1,068,998. Patented July 29,1913.

WITNESSES: 7 INVENTORJ} I Ji'zn P. Germm and W3, Jeram 0.?006,

ATTORNEY.

COLUMBIA PLANOGRAPH C0..WASH1NBTON. D. c.

" UNITED STATES PATENT OFFICE.

JOHN P. GERMAN AND AARON O. POOL, 0F SCERINGFIELD, MASSACHUSETTS.

SUSPENSION-SU 'IPORT FOR ELECTRIC LAMBS.

Specification ofv Letters Patent.

Patented July 29, 1913.

Application filed February 8, 1913. Serial No. 747,069.

To all whom it may concern:

Be it known that we, Joni; P. GERMAN and AARON O. PooL, a subject of theQueen of the Netherlands and a citizen of the United States of America,respectively, both residents of Springfield, in the county of HampdenState Massachusetts, have invented certain new and useful- Improvementsin ShspensiouSupporte for Electric Lamps, of which the following is afull, clear, and exact description,

This invention relates to an adjustable suspension support for anincandescent electric lamp, more especially available in machine shopsand factories, which has the capability of supporting the lamp anydesired distance below the top of a room and also at points more or lessradially removed from the normal line of suspension.

An object of the invention is to improve the means for holding theextension nien1- bers of the support in their parallel relations, forpreventing them from having revoluble movements one relatively to theother and to retain the extension or movable member in any positioneither high, low or intermediate, in which the same may be set.

Another object is to provide in the device an improved adjust-ablesupport for a lamp socket holder by reason of which the utility of thedevice is greatly increased. And an object of the invention,furthermore, is to so construct the suspension support and itsappurtenances that the same shall be practicable and inexpensive ofmanufacture, durable and capable of use for an indefinite time withoutliability of derangement or need of repair.

The invention is described in conjunction with the accompanying drawingsand set forth in the claims.

In the drawings: Figure 1 is a side elevation of the suspension support.Figs. 2, 3 and 4 are horizontal cross sectional views in detail as takenrespectively on lines 22, 3-3, and 4:4=, of Fig. 1, 5 is a sideelevation of the lower portion of the device indicating one of manychanged positions for thelamp.

Similar characters of reference indicate corresponding parts in all ofthe views.

Included in the suspension support are two vertical members, A and B,the one B being essentially a tube open from end to end while the memberA, which is herein termed a rod, may be of tubular form forsubstantially its entire length. The tube B has at its upper end rigidlysecured thereto a member D which is made with a circular hole f in itsportion that is oflse t from the tube and such apertured portion has anembracing relation to the rod A so that the tube and its member D may beslid along and in parallelism with the rod. The said member D oppositethe spline groove has a pin 9 inserted with a tight driving fit in atransverse hole thereforin the member D, the inner extremity of such pinentering the spline groove 6 and serving as a key to prevent revolublemovementof the tube relatively to the rod.

The rod at its lower end has a member E somewhat similar to the one Drigidly secured thereto (the set screws h and h serving for theconfinements) ,ana said member E at its portion offset from the rod isconstructed with a vertical hole a therethrough whereby the tube mayfreely slide through this latter mentioned apert-ured. portion.

The tube at its side opposite from the rod has a series of depressions jarranged in the ,vertical longitudinal line of the rod; and v theportion of the member E farthest offset from the rod is horizontallydrilled to form a bore oi'cavity 72 inwhich is fitted an engagementpiece m, preferably a steel ball the same being yieldingly pressed bythe spring 12 in such bore and having an abutment against the inner endof the screw plug 0 which serves both to close the bore and to vary thetension of the spring. The tube at its lower end portion has a pair ofspaced collars p and q, and G represents a radial and horizontallydisposed arm made with an annular end p ortion 1 which has an encirclingengagement about the tube and t which is engaged between said collars.Thus the arm G is revoluble entirely around the lower end of the tube,and is held against displacement in the lineof the tube axis. To theouter end of the tube a link'L is pivoted; and to the extremity of thelink a clamp or yoke M which constitutes a holder for the socket of anincandescent lamp is pivoted.

The pivot joints 8, 8 for the link are constituted by screws engaged bynuts so that the joints are frictioned or tensioned whereby the lampsocketholder will remain in any position of adjustment to which it maybe swung relatively to the link and so that the link will remain in anyposition of adjustment to which it may be swung relatively to thehorizontal revoluble arm.

The electric lamp cable P provided suiticiently slack above the upperend of the tube, passes down through the tube to its connection with thesocket of the electric lamp. When the lamp is in disuse, the tube willbe slid to its uppermost position so that it is out of the way andpractically opposite the rod; but, of course, the tube may be sliddownwardly in any extent desired to place the lamp in a position, as toheight, of greatest advantage. In the vertical movements of the tube,the spring pressed ball clicks past the successive depressions and thenremains in some one of such depressions, serving as a detent for theretentio-n of the tube in its given set position.

As shown in Fig. 1, the lamp socket holder is arranged horizontally sothat the axes of the lamp socket and the tube are coincident, thejointed link L having an oblique posi tion. The link may be swung to aposition, for instance, as represented in the full lines in Fig. 5,whereby the lamp is bodily carried offside from the tube axis; again,for instance, the link may be swung to an upward inclination, asrepresented by the dotted lines in Fig. 5, whereby the lamp may beupwardly directed while oiiside from the support, and by therevolubility of the arm G, the lamp ofiside from the support eitherupwardly or downwardly directed, or axially or on any oblique line, maybe swung around to any point to the front, rearward or to the rightwardor leftward of the support. And, moreover, the depending hook of theceiling plate, in one plane, and the eye member at the top of the rod ina plane right angular to that of the hook, form in substance a universaljoint so that the suspension support with the lamp may be swung in anydirection from the point of suspension to carry the lamp far oiisidefrom the normal suspension line.

We claim 1. A rod, having a longitudinal spline groove therein, andmeans for the sus pension of same, a tube arranged alongside of said rodhaving a member rigidly carried thereby which has an embracing relationto said rod, and is provided with a projection engaging in said splinegroove, and said rod having a member rigidly secured thereto and havingan embracing relation about said tube, said parts being constructed sothat the tube carried member is slidable along the rod and the rodcarried member is slidable along the tube, the tube having at its lowerportion a radial and horizontal arm revolubly connected thereto, a linkpivoted to the arm and a lamp-socket holder pivoted to the link.

2. A rod, and means for the suspension of same, a tube,.arrangedalongside of said rod, having a series of spaced depressions in itsside, and having a member rigidly carried thereby which has an embracingrelation to said rod, and said rod having a member rigidly securedthereto and having an embracing relation about said tube, which memherin its tube embracing portion has a cavity therein, with a springpressed piece in said cavity adapted to engage in said depressions inthe tube, a radial and horizontal arm revolubly connected to the lowerportion of the tube, a link pivoted to the arm, and a lamp-socket holderpivotally jointed to the link.

3. A rod, having a longitudinal spline groove therein, and means for thesuspension of same, a tube, arranged alongside of said rod, having aseries of spaced depressions in its side, and having a member rigidlycarried thereby which has an embracing rela tion to said rod, and 1sprovided with a pro- JQCtlOIl engaging in said spline groove, and

said rod having a member rigidly secured thereto and having an embracingrelation about said tube, which member in its tube embracing portion hasa cavity therein, with a spring pressed piece in said cavity adapted toengage in said depressions in the tube, a radial and horizontal armrevolubly connected to the lower portion of the tube, a link pivoted tothe arm, and a lamp JOHN P. GERMAN. AARON O. POOL.

WVitnesses:

G. R. DnIsooLL, B. A. SEAVER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner offatents,

Washington, I). 0.

